Kapton H [25036-53-7] polymers with the structure I are held together by Van der Waals and, probably, charge-transfer forces, and are ordered mainly along the fiber axis, but show little order in the packing of adjacent helixes. X-ray anal. data fit a model in which the COC angle is 130, and the segments joining the ether O atoms form a planar zigzag chain. The proposed crystal packing contains a 2 monomer unit cell with a = 4.66, b = 32.9, c = 5.66.ANG., .beta. = 100, probably of space group P21. An intrachain vector distribution map, computed by rotating the diimide unit of the N-C bond, was compared with a 1-dimensional Patterson synthesis calcd. along b, to det. .theta.. The Van der Waals energy was calcd. as a function of .theta. and of the rotation around the helical axis of the polymer chains. _
An x-ray and conformational study of Kapton H / G., Conte; D'Ilario, Lucio; Pavel, Nicolae Viorel; Giglio, Edoardo. - In: JOURNAL OF POLYMER SCIENCE. POLYMER PHYSICS EDITION. - ISSN 0098-1273. - STAMPA. - 14:9(1976), pp. 1553-1560. [10.1002/pol.1976.180140902]
An x-ray and conformational study of Kapton H.
D'ILARIO, LUCIO;PAVEL, Nicolae Viorel;GIGLIO, Edoardo
1976
Abstract
Kapton H [25036-53-7] polymers with the structure I are held together by Van der Waals and, probably, charge-transfer forces, and are ordered mainly along the fiber axis, but show little order in the packing of adjacent helixes. X-ray anal. data fit a model in which the COC angle is 130, and the segments joining the ether O atoms form a planar zigzag chain. The proposed crystal packing contains a 2 monomer unit cell with a = 4.66, b = 32.9, c = 5.66.ANG., .beta. = 100, probably of space group P21. An intrachain vector distribution map, computed by rotating the diimide unit of the N-C bond, was compared with a 1-dimensional Patterson synthesis calcd. along b, to det. .theta.. The Van der Waals energy was calcd. as a function of .theta. and of the rotation around the helical axis of the polymer chains. _I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
